Damper control means for furnaces



Aug 23 1932. H. MEACHEM DAMPER CONTROL MEANS FOR FURNACES Filed April 15, 1951 2 Sheets-Sheet 1 1932 r H. MEAcHE'M DAMPER CONTROLMEANS FOR FURNACES Filed April 15. 1931 2 Sheets-Sheet 2 Evwzutoz Harry flmcjwm,

Patented Aug. 23,; 1932 UNITED STATES PATENT OFFICE ARE: MEACHEM, OF 'rEANEoK, NEw JERSEY, ASSIGNOR T0 ronn DRY noon, ENGINEERING & REPAIR CORPORATION, oEBRooKLYN, NEW YORK DAMPER CONTROL MEA S roE rUENAoEs This invention relates to furnaces employ- I 7 ing' a blower to create the primary air supply, and having induced or secondary air supply means, which may be in theform of an air box or hollow front whose inlet is con-,/ trolled by a damper, and the purpose of my improvement is to provide automatic means, for operating the damper so that the supply of air to the air box may be shut off when the blower ceases to function and said damper may be caused to open when the blower starts up. F

With an automatically controlledfurnace it has been found that when the thermostat or pressurestat has shut ofi the flame and the damperis left open cold air is induced into 1 the fire box and rapidly cools oift he furnace, consequently shortening the shutdown period of the flame. 'By means of an automatic damper control which will eliminate the cold air the shut down period will be lengthened and considerable economy of. fuel will result.

provision of damper control means whose 4 25 Therefore my invention consists in the opening action is a functionof the pressure exerted by the blower, and whose closing action is performed by gravity means whiclrbecome operative upon cessation of blower pres-' In otherwords the damper is counterbalanced by a weight which tends to hold the damper in its closed position, and means are provided whereby thetpressureof the blower is applied to overcome the gravity influence of the weight and to 'opei the damper.- Other features and a vantages of my invention will hereinafter appear.

' In the drawings:

Figure '1 is a front View of a furnace, having an air box, with a damper, and provided with a blbwer, also having my improved damper control means. 7 7 Fig. 2 is a top plan view of Fig.1, and

Fig. 3 is a detail of the operating cylinder, piston and weight.

In the drawings let 1 indicate the throat of a furnace which may be equipped with suitable fuel burning means, (not shown) and let 2 indicate a hollow-front, or'air box, hav-' that has a rod 8 pivoted thereto.

ing the damper 3 to control theinlet for secondary air supplies.

At 4 there appears a blower; which is operated by a motor 5, for delivering the primary air supply'under pressure to the fuel burn mg means.

The parts thus far referred to are of usual 4 character.

' Attached as to the blower casing is a vertic-ally disposed cylinder 6, having its upper end open, and inwhich is placed a piston 7 The bottom of cylinder 6- s connected,as by a pipe 9, with the'blower casing, so that when the blower is operating, pressure therefrom will pass to the cylinder to raise the piston therein. j

A lever 10, fulcrumedas at 11 in a' fixed support 12, is pivotally connectedat one end to rod 8 as at 13, said leverengaging at its other end, as at 14, with one end of a pitman 15, whose other end engages a crank 16 that operates the damper.

13y ahturnbuckle 17 for its adjustment in weight 18, carried by rod 8, normally forces the piston 7 to the bottom of cylin:

The pitman 15 is in two parts, connected der 6, as appears in Fig. 1, in which position of the piston the lever 10, through the pitman 15 and crank 16, holds the damer in its closed position. .In Fig. 1 the amper is shown closed in dotted lines, and open in dot and dash lines.

Butwhen the blower is operating and pres:

sure is introduced into the cylinder 6 throughv pipe 9, thereby the piston 7 is forced up-' wardly, as appears in Fig. 3,and in this action the damper is moved to its open position.

invention are equally comprehended by Iclaim: 1'. The combination with a furnace having induced air supply means, a damper there-u for,'and' ablower, to supply primary air of a cylinder located in fixed relation to said fur nace, a piston in said cylinder, a pistonrod adjustable connecting means between said rod/ and damper, a weight carried by said piston to counterbalance said damper and normall 10 close it while holding'the piston depresse communicating'means between said blower and cylinder whereby pressure from the blower will raise the piston and cause the damper to open, and ad'ustable means for u regulating the stroke of t e piston. R

c 2. The'combination with a furnace having induced air supply means, a damper therefor, and a blower to suppl primary air, of 3. cylinder located in fixe relation to saidfur- 2 nace, a piston in said cylinder, a piston rod,

. adjustable connecting means between said. rod and damper, a weight carried by said piston to counterbalance said damper and nor mally close it while holding the piston dea pressed, and communicating means between I said blower and cylinder whereby pressure from the blower will'raise the piston and cause the dam er to open.

' 3. The com ination with a furnace havg ing induced air supply means, a damper therefor, and a blower to supply primary air, of a cylinder ldcated in fixed relation to 7 said furnace, a piston in said cylinder; a piston rod, connecting means between said rod 35 and damper, a weight carried by said piston to counterbalance said damper and normall close it while holding the piston depresse communicating means between said blower V and cylinder -whereby pressure from the 49- blower' will raise the piston and cause the dam r to open, and adjustable means for regpl t' the stroke oi the piston.

- ork, N. Y., April 13th, 1931. i

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